{"id":278816,"date":"2023-04-11T09:58:28","date_gmt":"2023-04-11T09:58:28","guid":{"rendered":"\/forum\/forums\/topic\/condensation-validation-issue\/"},"modified":"2023-04-11T09:58:28","modified_gmt":"2023-04-11T09:58:28","slug":"condensation-validation-issue","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/condensation-validation-issue\/","title":{"rendered":"Condensation validation issue"},"content":{"rendered":"

Hi,<\/p>\n

I’m simulating filmwise condensation over a tube in 2D with initally using pentane as the condensate. I’m trying to calibrate my model with another paper (S.R. Thomas Kleiner, Harald Klein, CFD model and simulation of pure substance condensation on horizontal tubes using the volume of fluid method, Int. J. Heat Mass Transfer 138<\/em> (2019<\/strong>) 420-431<\/span>.) <\/span>which is validated against Nusselt’s solution. <\/p>\n

During t = 0.05 s, the simulation looks approximatly the same as the papers’ result. However, at t = 1.00 s where they say it should provide a steady state solution, my results start to diverge from theirs as the film thickness becomes much larger at the bottom of the tube within the necking region and the jet. Whereas, in their results, the film thickness starts to reduce.<\/p>\n

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Because of this, I’m obtaining much lower heat transfer coeffcients that what they show. As such, it gives me a larger error in comparison to the Nusselt solution. Does anyone have any ideas as to why this is happening? If it is to do with buoyancy forces, I have set the operating density to be equal to the lightest phase which is the vapour in my case and still made no difference.<\/p>\n

Here is the geometry and the mesh of my setup if needed to know. <\/p>\n

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<\/p>\n","protected":false},"template":"","class_list":["post-278816","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t